SmallRig Magic Arm with Dual Ball Heads (1/4”-20 Screw) 2070B can be used to mount an accessory on your camera rig firmly and flexibly. Each end of the arm is equipped with a 1/4"-20 screw and a convenient thumbwheel for effortless accessory attachment.Rubber pads are integrated to protect your equipment from scratches..Use the included small hex key to further tighten the thumbwheel if heavy device is attached. Both ball heads are secured using the single, large thumb lever. Compatible with a wide range of device such as field monitor, LED light, sound gear, etc., this arm has a load capacity of up to 5 kg/11 lb